Acan of engine oil with a length of 150 mm and a diameter of 100 mm is placed vertically in the trunk of a car. on a hot summer day, the temperature in the trunk is 43°c. if the surface temperature of the can is 17°c, determine heat transfer rate from the can surface. neglect the heat transfer from the ends of the can

Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?